HTML Formatter & Minifier ⚡ Instant & 100% Private
Beautify, clean, indent, and minify HTML markup instantly with custom indentation and quote options.
How to Use the Online HTML Formatter & Minifier
Messy, unindented, or minified HTML makes debugging, code reviews, and website maintenance exhausting. AWSM Tools provides an ultra-fast, client-side HTML beautifier and minifier designed for web developers. It runs 100% in your browser memory with zero server uploads, offering instant formatting, custom indentation (2 spaces, 4 spaces, or tabs), quote normalization, and one-click minification.
Step-by-Step Guide
- Paste Your HTML: Paste your raw markup into the left pane, or click Sample to test with a pre-loaded template.
- Select Format or Minify: Choose between 2 Spaces, 4 Spaces, Tab, or Minify using the top control bar.
- Set Formatting Preferences: Optionally choose attribute quote styles (double quotes, single quotes, or original) and comment handling (keep or remove).
- Copy or Download: Your formatted or compressed HTML appears instantly in the output window with 1-click Copy Output and Download .html options.
Technical Reference: HTML Formatting & Minification Matrix
| Formatting Feature | HTML5 Standard | XHTML Standard | Production Minified | Best Practice |
|---|---|---|---|---|
| Indentation | Flexible (2 or 4 spaces) | Hierarchical | 0 spaces (single line) | 2 spaces (React/Vue/Git default) |
| Void Elements | <br>, <img> |
<br />, <img /> |
No trailing slash | HTML5 void tags (no slash) |
| Attribute Quotes | Double or single quotes | Strict double quotes | Collapsed attributes | Consistent double quotes "..." |
| Tag Casing | Case-insensitive | Strict lowercase | Lowercase | Lowercase <div> |
| Comments | <!-- ... --> |
Strict XML comments | Stripped completely | Preserve in dev, strip in prod |
🔍 Need to Validate HTML & Catch Unclosed Tags?
Use our free in-browser HTML Validator & Syntax Checker to detect unclosed tags, WCAG accessibility errors, and duplicate IDs with a quality score.
Frequently Asked Questions
No. AWSM Tools executes all formatting, indentation, minification, and parsing 100% locally in your web browser memory. Your confidential code, internal templates, API data, and inline scripts never leave your machine and are never uploaded to any remote server.
You can configure indentation width (2 spaces, 4 spaces, 3 spaces, or tabs), attribute quote styles (force double quotes, single quotes, or keep original), tag casing (lowercase vs uppercase), HTML comment preservation or stripping, HTML5 void vs XHTML self-closing tags, attribute line wrapping, and embedded script/style formatting.
In modern HTML5, void elements such as
<img>, <br>, <input>, and <meta> do not require or use a closing slash. In XHTML and XML specifications, all self-closing elements require a trailing slash (e.g. <img src="..." />). AWSM Tools allows you to toggle between both conventions seamlessly.
Yes! Clicking "Auto-Fix" automatically replaces curly/smart quotes with straight quotes, normalizes unquoted attributes (e.g.
class=box to class="box"), standardizes the doctype, and balances common unclosed structural tags like div, span, p, and li.
HTML minification strips unnecessary whitespace, line breaks, comments, and redundant attribute values. This reduces payload size by up to 30-60%, cutting down Time to First Byte (TTFB), speeding up First Contentful Paint (FCP), and improving Core Web Vitals scores.